Compressor



924 1151x376 Odi 14' E c. c. sPREEN .COMPRE S S OR Filed oct. 17'. 192sNVE/VTC@ Patented @cti Mi, 1924.,

frans CHARLES C. SPREEN, 0F DETROIT, MICHIGAN, ASSIGNOR -TO KELVNATORCORPORA- TION, OE DETROIT, MICHIGAN, A CORPORATION 0F DELAWARE.

ooinraassoa.

Application ledl October 17, 1923.

To all whom t may cof/wcm:

Be it known that l, CHARLES C. SPREEN, a citizen of the United States,residing at Detroit, in the county of Wayne and State of Michigan, haveinvented a certain new and useful lmprovement in Compressors, of whichthe following is a full, clear, and exact description, reference beinghad to the accompanying drawings.

It is advisable to provide, in compressors 4 utilized for compressingthe refrigerant in a mechanical retrigerating system, some means bywhich oil in the refrigerating system may return to the crank case ofthe compressor. My invention provides an improved means for thispurpose. In the drawings accompanying this specification and forming apart thereof I have shown, for purposes of illustration, one form whichmy invention may assume. In these drawings the single ligure representsa vertical section through a compressor embodying this illustrative formof my invention.

The compressor herein described comprises a casing 11 containing withinitself a crank case chamber 12 in which is mounted a crank shaft 13which operates, by means of a pitman 14, a piston 15 arranged toreciprocate within a cylinder 16 which is receivable within the casing11, defines within itself a compression chamber 17, defines betweenitself and the casing 11 an inlet chamber 18, is provided with asuitable port 19 arranged to ai'ord communication between the inletchamber 18 and the compression chamber 17 when the piston 15 is loweredasshown herein and is provided with a suitable outlet valve adapted toafford communication, between the compression chamber 17 and the outletchamber 21.

It will be obvious from the above description that rotation' of thecrank shaft 13 will act through the pitman 14 to operate the piston 15within the cylinder 16 from the position herein shown to a slightlyhigher position wherein the port 19 is closed and thence through aseries of positions to that in which the piston 15 has reached the upperlimit of its travel and the Huid within the compression chamber 17 hasbeen compressed and expelled through the outlet valve 20 into the outletchamber 21 after which continued rotation of the crank shaft 13 willretract the piston Serial No. 669,142.

15 into the position herein shown and by uncovering the port 19 permitthe introduction of a treshcharge of refrigerant from the inlet chamber18 into the compression chamber 17.

During the operation of the compressor oil from the crank case chamber12 is continually splashed upon the inner walls ot' the cylinder 16 and,with each stroke of the piston 15, a certain amount of this oil iscarried into the compression chamber 13 and thus into the ret'rigeratingsystem. Oil in the refrigerating system not only interferes with theproper' action of the refrigerant but also causes knocking and poundingof the compressor and accordingly it is highly desirable that any suchoil be afforded an outlet through which it may escape trom therefrigerating system. rlhe embodiment of my invention herein disclosedprovides this outlet by forming in the cylinder 16 adjacent the lower.edge of the inlet chamber 18 an aperture 22 connecting the inlet chamber18 with the crank case 12. Becauseof the direction in which thisaperture extends the likelihood ofoil being splashed therethrough intothe inlet chamber 18 is negligible while the suction of oil vapor intothe inlet chamber 18 is prevented b closing the aperture 22, as by adepen ing skirt 23 on the piston 15, whenever the port 19 is uncoveredand iuid is being drawn from the inlet chamber 18 and by uncovering theaperture 22 only when the pressure within the inlet chamber 18 issuihcient to prevent any appreciable inow into the inlet chamber 18through the aperture 22.

It will be apparent to those skilled in the art that 1 have provided animproved means for permitting oil and other foreign matter to escapefrom the rerigerating system. At the same time, it will be readily'apparent to those skilled in the art that the particular constructionherein shown and described may be variously modified'without departingfrom the scope of my invention or sacricing the advantages thereof andthat this disclosure is illustrative only and my invention not limitedthereto.

li claim:

1. A compressor comprising a crank case chamber and an inlet chamberconnected by means of a duct adapted to permit foreign matter such asoil to pass :from said inlet chamber to said crank case chamber,`

and'comprising means arranged to maintainsaid duct closed Whenever saidinlet chamber is connected to the compression chamber of saidcompressor.`

2. A compressor provided with a crank case chamber and -an inlet chamberand a compression chamber and with a duct adapted to permit the passagefrom said inlet chamber to said crank casechamber of foreign matter suchas oil, and comprising means arranged to maintain said duct closedWhenever said inlet chamber is in communication With said compressioncham.

ber.

3. A compressor provided with a crank case chamber and an inlet chamberand a compression chamber and With a duct adapted to permit the passagefrom1 said inlet chamber to said crank case chamber of foreign mattersuch as oil, and comprising a piston cooperating With said compressionchamber and adapted to close said duct during a portion of its stroke.

4. A compressor provided with a crank case chamber and an inlet chamberand a compression chamber and with a duct adapted to permit the passagefrom said inlet chamber to said crank case chamber of foreign mattersuch as oil, and comprising a piston operating in lsaid compressionchamber and adapted to closesaid duct Whenever said compression chamberis in communication' With said inlet chamber.

5. A compressor providedwith a crank case chamber and an inlet chamberand a compression chamber and with a duct adapted to permit the passagefrom Said inlet chamber to said crank case chamber of foreign mattersuch as oil, and comprising a piston operating Within said compressionchamber, adapted to cover and uncover a port connecting said compressionchamber With said inlet chamber, and arranged to maintain said ductclosed whenever said port is open. f

In testimony whereof, I hereunto affix my signature. l

CHARLES o. SPREEN.

